Adam Gross, the son of a former Oconomowoc alderman, will spend the next three years of his life behind bars — and 15 on a sex offender registry — for child pornography possession, a Waukesha County Circuit Court judge ruled recently.

Judge Maria S. Lazar handed down that sentence to Gross on Sept. 27, court records show. In July, she found him guilty of two counts of possession of child pornography.

Lazar ruled that Gross will serve three-year prison terms and three years of extended supervision on each count concurrently. He was taken into custody immediately after the hearing.

Police in May 2016 obtained a search warrant for the Gross residence on Concord Road — which Adam shares with his father — and seized the computer and a hard drive from Adam Gross' room, the complaint said. Investigators also reportedly found used children's underwear in a vacuum-sealed pack.

John Gross said in the complaint he was "sickened" by the discovery of the pictures and "wanted to throw up." Gross served as a city alderman from 1989-2007 and again from 2015-17.

He told police that Adam had lived with him for about 10 years, after his son's divorce, and said his son had purchased the computer on his own, according to the complaint.

Adam Gross initially faced 10 counts of child porn possession, but the remaining eight were dismissed and read in as part of a plea agreement, records show.

As conditions of Gross' extended supervision, Lazar ordered that he register as a sex offender for 15 years, prohibited him from having any unsupervised contact with minors and prohibited him from using a computer without his probation agent's consent.